# Holography for the very early Universe and the classic puzzles of Hot Big Bang cosmology

## TL;DR

This paper demonstrates that holographic models based on perturbative 3D QFT can resolve key puzzles of hot Big Bang cosmology, such as the horizon, flatness, and relic problems, by mapping cosmic evolution to RG flow.

## Contribution

It introduces a holographic approach to early universe cosmology that offers solutions to classic Big Bang puzzles through dual QFT and RG flow properties.

## Key findings

- Holographic models solve horizon and flatness problems.
- Cosmic evolution corresponds to inverse RG flow in dual QFT.
- Resolutions rely on properties of the RG flow.

## Abstract

We show that standard puzzles of hot Big Bang cosmology that motivated the introduction of cosmological inflation, such as the smoothness and horizon problem, the flatness problem and the relic problem are also solved by holographic models for very early universe based on perturbative three dimensional QFT. In the holographic setup, cosmic evolution is mapped to inverse renormalization group (RG) flow of the dual QFT, and the resolution of the puzzles relies on properties of the RG flow.